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| Titel |
Acoustic tomography in the atmospheric surface layer |
| VerfasserIn |
A. Ziemann, K. Arnold, A. Raabe |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 17, no. 1 ; Nr. 17, no. 1, S.139-148 |
| Datensatznummer |
250013651
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| Publikation (Nr.) |
 copernicus.org/angeo-17-139-1999.pdf |
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| Zusammenfassung |
Acoustic tomography is presented as a
technique for remote monitoring of meteorological quantities. This method and a
special algorithm of analysis can directly produce area-averaged values of
meteorological parameters. As a result consistent data will be obtained for
validation of numerical atmospheric micro-scale models. Such a measuring system
can complement conventional point measurements over different surfaces. The
procedure of acoustic tomography uses the horizontal propagation of sound waves
in the atmospheric surface layer. Therefore, to provide a general overview of
sound propagation under various atmospheric conditions a two-dimensional
ray-tracing model according to a modified version of Snell's law is used. The
state of the crossed atmosphere can be estimated from measurements of acoustic
travel time between sources and receivers at different points. Derivation of
area-averaged values of the sound speed and furthermore of air temperature
results from the inversion of travel time values for all acoustic paths.
Thereby, the applied straight ray two-dimensional tomographic model using SIRT
(simultaneous iterative reconstruction technique) is characterised as a method
with small computational requirements, satisfactory convergence and stability
properties as well as simple handling, especially, during online evaluation.
Key words. Meteorology and atmospheric dynamics
(turbulence; instruments and techniques). |
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